If a cell in a term list defines a valid member reference, such
as [Outlet].[h1].[city].[boston], then %LOOKUP
resolves this reference and does not return the member reference as
a literal value. This is mainly to be compatible with term lists created
for use with %TERMLIST.

For another example, the following query returns the list of
cities whose population is greater than the cut off value in the term
list:

SELECT FILTER(Outlet.City.Members,Outlet.H1.City.CurrentMember.Properties("Population")>%LOOKUP("Values","CutOff"))
ON ROWS,Outlet.H1.City.CurrentMember.Properties("Population") ON COLUMNS FROM HOLEFOODS